Website editors can now edit CSS and LESS styling directly in a dedicated editor similar to the existing HTML editor. This makes it easier to customize website appearance, search within style files, and recover or continue work on edited assets.

Make css/less editor same like html editor
- Task : https://www.odoo.com/web#id=8512&view_type=form&model=project.task&action=333&active_id=131
- Pad : https://pad.odoo.com/p/r.GhTsp9cnJJC6dgaz